With the front jacked up, try turning both wheels. If both are locked up, then bleed the right side of the car by opening the brake bleeder. DO NOT touch the brake pedal. Just open the bleed screw and allow the fluid to come out. Close the bleeder, and then check the other wheel to see if it is still locked. If it is, then the hoses are bad. If it isn't, then the problem is upstream. Have an assistant help you bleed the brake that you had just opened the bleed screw. Then step on the brake once and see if both wheels are locked. If they are, then you need to loosen the brake master cylinder from the booster. If the wheels then are able to be moved, the booster is the problem. If they are still locked up and the master cylinder is loose from the booster, it is the master cylinder or proportioning valve. I know of no easy way to test a proportioning valve, so you will be on your own to decide which one you want to replace for trial and error method of repairing. You also might have more than one problem with the system that will require replacement of two or three items to resolve the issue.